LETTER OF TRANSMITTAL 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., January 31, 1911. 



SIR: I have the honor to transmit for your approval a report by 

 Bernhard C. Hesse, a color expert, containing both original chemical 

 work done in the bureau since the passage of the food law on anilin 

 dyes used for foods, and a valuable and extensive compilation of the 

 literature of the subject, especially with reference to the harmfulness 

 of coal-tar colors and their physiological effects. These data formed 

 the basis of the opinions stated in Food Inspection Decisions 76, 77, 

 and 106, and are presented in detail as of scientific and practical 

 interest to all those concerned in the use of coal-tar colors in foods, 

 whether as manufacturers, food officials, or consumers. I recommend 

 the publication of this report as Bulletin No. 147 of the Bureau of 

 Chemistry. 



Respectfully, H. W. WILEY, Chief. 



Hon. JAMES WILSON, 



Secretary of Agriculture. 



